Yomitan is a free browser extension that provides pop-up dictionary lookups while reading. It shows definitions, word frequencies, native audio and example sentences, and can send lookups to Anki as flashcards. The extension supports Chrome, Firefox and Edge and runs on Android devices.
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Yūzōnō is an extension store for Mihon/Komikku, Aniyomi/Anikku and their variants. It provides manga extensions sourced from over a thousand sources and anime extensions from hundreds of sources, alongside troubleshooting resources. The service requires users to run the latest version of supported apps, including Mihon, TachiyomiSY and Komikku, as outdated app versions will display empty or obsolete extension lists.
ZXPInstaller is an open source installer for Adobe extensions that replaces the Extension Manager, which Adobe no longer supports as of CC 2015. It installs .zxp extension files and does not manage or uninstall extensions. Downloads are offered for OS X and Windows.
Collection of tools for livestreaming, with sections for OBS plugins, overlays, desktop and mobile apps, web tools, Twitch extensions, and a livestreaming glossary.
FluxDown is a free and open source download manager with a Rust engine. It is GPU-rendered and supports HTTP, FTP, BitTorrent, eD2K, HLS and DASH in a single queue. Available builds include Windows, macOS, Linux, Docker/NAS, Android and a browser extension.
Hackertab is a free start page for developers that shows daily developer news, trending GitHub repositories and tech conferences, curated hourly from more than 50 sources. It is available as a browser extension for Chrome, Firefox, Brave and Edge and as a web version, with no account required to browse news. The site describes it as free and open source with no tracking.
Malfrat's OSINT Map is a web-based tree of open source intelligence tools and methods, presented as an alternative version of osintframework.com. Its legend marks items that require installation, need purchases, are web-based, are guides, lead to .onion sites, are browser extensions, or are offensive-OSINT that might alert the target.
PowerRename is a Windows utility from PowerToys for bulk file renaming. It performs search-and-replace and regular expression renames across multiple selected files, shows expected results in a preview window before finalizing, and allows the operation to be undone after completion. Options include matching all occurrences and case sensitivity, with application limited to filename or extension.
PrivacySpy is an open project that grades and monitors privacy policies on a ten-point scale for convenience and accountability. It maintains a directory of products with scores, offers a free browser extension and API, and is maintained by volunteers. It is a project of Politiwatch, a registered 501(c)(3) organization.
The Twitch Developers site provides documentation and products for building third-party experiences with Twitch. Products include Twitch API, EventSub, Extensions, Chat and Chatbots, PubSub, Embedding Twitch, Drops, game engine plugins and authentication.
uBlacklist is a browser extension that prevents specified sites from appearing in Google search results. Rules can be added from search result pages or by clicking the toolbar icon, using match patterns or expressions with regular expressions and variables. Rulesets can be synchronized across devices via cloud storage or browser sync, and public rulesets can be subscribed to.
Userscripts is an open source Safari extension that saves and runs JavaScript and CSS code for visited websites. It is offered on the App Store as a free user script and style manager, with use cases spanning automatic page redirection, website page manipulation, custom ad-blocking, and custom code or style injection. The app provides no user tracking.
) - TypeScript SDK for NIP-46 (Nostr Connect) and NIP-07 browser extension signing.
A browser-based tool for watching multiple Twitch live streams at once in a single tab. It offers universal mute controls and a grid that scales automatically with the number of channels. Streams start muted, and up to 100 channels can be loaded. It works client-side without extensions or accounts and is aimed at desktop monitoring.
2FAS is an open-source and source-available authenticator app and password manager. It stores passwords and 2FA tokens locally on the device, requires no accounts, and offers a browser extension, cloud and manual backup, and token customization. A free Pass tier is available, and an Unlimited tier costs $9.99 per year.
2FAuth is a self-hosted OTP manager for individuals and teams. It stores, generates and organizes two-factor authentication codes in a web application, with QR code scanning, manual setup, import and export, and browser extensions. It supports multi-user management, isolated personal vaults and encrypted secrets storage.
A suite of tools for 5th Edition Dungeons & Dragons players and Dungeon Masters, serving as a digital reference for products the user owns. Includes the Plutonium module for Foundry virtual tabletop, which imports most 5etools content, and the Rivet browser extension for sending content and rolls from the site to Foundry. No account system; data is stored in cookies.
Accessibility Insights is an open-source set of tools for finding and fixing accessibility issues. Accessibility Insights for Web is a browser extension for Chrome and Microsoft Edge that tests webpages and web applications; Accessibility Insights for Windows is a desktop tool for Windows applications. FastPass is used to find common accessibility issues. The Android tool is no longer available for download.
Aconvert.com converts document, ebook, image, icon, video, audio and archive files online for free. Users select a local file and a target format, then convert; batch conversion is available by adding multiple files. The site is an extensional site of PDFConvertOnline.com.
Adaptive Tab Bar Colour is an open source browser tool for improving tabs, bookmarks, extensions, or browsing workflows.
Better DeepSeek is an open-source browser extension that adds tools to the DeepSeek chat interface, including a customizable system prompt, persistent memory, and tag-based output. It can generate downloadable files, PowerPoint and Excel documents, and multi-file ZIP projects, and run Python in the browser. The project is described as unofficial and independent.
addy.io is an open-source anonymous email forwarding service. It creates email aliases that forward to a real inbox, letting users give each website a different address and deactivate aliases that begin receiving spam. The service offers mobile apps, a browser extension and GPG/OpenPGP encryption.
AdGuard browser extension project for blocking ads, trackers, annoyances, and malicious pages.
AgentDock is a writing editor, Chrome extension, open prompt library, and agent API, all stated as live. The editor supports writing, citing, and publishing documents, with citations pulled from Zotero, Mendeley, and DOIs. An AI employee for business use is described as shipping Q3 2026.